Typical Faults Simulation Analysis and Protection Improvement Suggestions of Niu-cong HVDC Niuzhai Station

doi:10.11985/2021.02.022

Abstract

Abstract:

In order to study the development mechanism of faults and the action characteristics of current protection system in Niu-cong HVDC Niuzhai station theoretical basis for HVDC control protection logic optimization is provided. The typical faults of Niuzhai station in the simulation model of Niu-cong HVDC PSCAD/EMTDC is set up. It is found that the HVDC system can return to normal quickly after eliminating the faults on the grid side of converter transformer of Niuzhai station. The grounding fault of valve side of converter transformer and valve area will results in strong current flowing through the grounding electrode of DC Niuzhai side, short circuit faults will leads to the development of three-phase short circuit in AC side. It points out the disadvantage of the current 50 Hz protection and puts forward the improvement measures. According to the characteristics of valve short-circuit, a new criterion of valve short-circuit protection is proposed, which can form dual protection with the current protection principle, and provide theoretical reference for the design of HVDC engineering protection system in the future.

Key words: Niu-cong HVDC, typical faults, simulation of PSCAD/EMTDC, 50 Hz protection, valve short circuit protection

CLC Number:

TM771

DAI Shulong, ZHANG Rui. Typical Faults Simulation Analysis and Protection Improvement Suggestions of Niu-cong HVDC Niuzhai Station[J]. Journal of Electrical Engineering, 2021, 16(2): 174-180.

Figures/Tables 10

References 17

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时间	原因	50 Hz保护动作情况
2014年04月14日19:42	牛从乙直流极1换流变充电	从西站牛从甲双极切换控制系统,牛从甲直流功率由1 550 MW降至960 MW
2014年05月19日23:39	溪洛渡电厂17号主变充电	从西站牛从甲切换控制系统,牛从甲直流极2的50 Hz保护动作,该极转为备用状态,牛从甲直流极1功率回降
2014年06月02日00:43 2014年06月02日21:04	牛从乙直流极2换流变充电	从西站牛从甲双极切换控制系统,功率回降目标值为960 MW(充电前功率已调整为960 MW)
2014年06月02日20:45 2014年06月02日22:35 2014年06月02日22:51	牛从乙直流极2换流变充电	从西站牛从甲双极切换控制系统